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E20-350 - Network Storage - SAN Implementation - Dump Information

Vendor : EMC
Exam Code : E20-350
Exam Name : Network Storage - SAN Implementation
Questions and Answers : 110 Q & A
Updated On : December 7, 2018
PDF Download Mirror : E20-350 Brain Dump
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E20-350 Questions and Answers

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E20-350 Network Storage - SAN Implementation

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E20-350 exam Dumps Source : Network Storage - SAN Implementation

Test Code : E20-350
Test Name : Network Storage - SAN Implementation
Vendor Name : EMC
Q&A : 110 Real Questions

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EMC EMC Network Storage -

Dell EMC Continues Relentless Innovation in Dell EMC unity and SC sequence Midrange Storage Arrays | killexams.com Real Questions and Pass4sure dumps

HOPKINTON, Mass., July 24, 2018 /PRNewswire/ --                                                     

Dell EMC

news summary:

  • Dell EMC is rolling out large application working system updates across its market-main midrange storage portfolio
  • New Dell EMC unity working ambiance (OE four.4) boosts file-primarily based replication and facts mobility and protection capabilities for block and file workloads
  • New SC series working equipment update (SCOS 7.three) grants enormously higher efficiency and skill good points, new Unisphere HTML5 interface and information-in-location upgrade capabilities
  • Dell EMC team spirit reaches milestone of 1 Exabyte of uncooked flash storage ability shipped when you consider that can also 2016 debuti
  • Full Story:

    building on its dedication of persevered funding and innovation in its midrange storage solutions, Dell EMC introduced important utility working gadget updates to Dell EMC team spirit and SC sequence, giving shoppers potent new features designed to prolong the performance, functionality and toughness of their product investments.

    As a part of the utility built into each Dell EMC unity and SC series All-flash and Hybrid storage arrays, consumers can upgrade their operating device non-disruptively and without charge (for customers with lively ProSupport agreements) to enrich workload efficiency, storage potential and facts protection and availability.

    "We introduced collectively the most advantageous engineers within the industry to speed up our innovation in storage and have delivered principal updates and important new aspects to our midrange portfolio, demonstrating the vigor of what we will do collectively to pleasure our shoppers," noted Jeff Boudreau, President, Dell EMC Storage. "With this release, we're continuing our relentless innovation in Dell EMC harmony and SC series by using supplying massive efficiency advancements, less demanding management, enhanced safety and improved efficiencies. We're helping our valued clientele modernize their facts facilities and resolve their right enterprise challenges."

    New Dell EMC cohesion OE points

    With greater than 1 Exabyte (1,000 PBs) of uncooked flash storage ability shipped considering its debut simply over two years agoii, Dell EMC solidarity has develop into the benchmark midrange storage answer. it's designed to bring the most effective in simplicity and price, enabling organizations to velocity deployment, streamline administration and seamlessly tier unified storage workloads to the cloud.

    the new Dell EMC cohesion operating environment positive factors here new replication, statistics mobility and security points to ensure uninterrupted operations of functions that help the business:

    Array-based mostly file replication

  • New Metrosync array-based file replication protects transactional file applications with swift healing and automatic failover to a secondary information core
  • 2-means NDMP improves performance for more desirable NAS backup times whereas cutting back WAN/LAN network congestion
  • information Mobility

  • constructed-in statistics mobility capabilities to migrate block facts from third-celebration storage arrays at once to Dell EMC harmony
  • safety Enhancements

  • LDAP/ad enhancements for performance, availability, and search flexibility for Microsoft environments
  • The addition of Metrosync for file gives you an entire complement of array-based replication, with synchronous and asynchronous block and file replication alternatives now covered with each Dell EMC unity Hybrid and All-Flash configuration. These replication alternate options combine to enhance transactional utility information RPO and RTO, lengthy distance disaster healing, and records aggregation and distribution.

    SC sequence positive factors performance, potential and new HTML5 UI

    For the past a couple of quarters, Dell EMC engineers have embarked on a desirable-to-bottom code optimization of SCOS to extract greater performance and effectivity from SC series hybrid and all-flash arrays, while also improving administration, analytics and monitoring.

    New SCOS 7.3 features encompass:

    MajorIOPS efficiency enhance

  • Now up to 2.2M max IOPS per array, over 20M in federated multi-array environmentsiii
  • 2X increase in highest IOPS throughout every existing SC array modeliv
  • 50,000-one hundred,000 extra combined-workload IOPS across every SC arrayv
  • more suitable management for single and multi-array environments

  • New Unisphere for SC HTML5 internet UI simplifies and automates commonplace storage management projects; shares regular look and consider with Unisphere for Dell EMC unity
  • easier, extra within your budget improvements and expansion

  • as much as 2X raise in optimum ability per arrayvi
  • facts-in-vicinity improvements for the popular SC4020 presents cost-effective choice for purchasers to migrate statistics to more recent SC fashions
  • SCv2000 can now federate/replicate with other SC sequence arrays
  • more commercial enterprise-type effectivity and availability

  • aid for 100Gb and 25Gb iSCSI network hardware presents customers future-proof options and purchasing assurance
  • allotted sparing, for more suitable I/O effectivity and up to 500% faster rebuildsvii
  • live quantity enhancements designed to deliver lower latency and reduced community traffic in excessive availability environments
  • via upgrading to the new SCOS 7.three, SC collection consumers can benefit an overnight raise in workload efficiency. Three SC array fashions now provide over 1 million IOPSviii.  Dell EMC exams demonstrate true-world applications akin to VDI and SQL OLTP can operate 33p.cix to fifty four%x quicker with SCOS 7.three.

    Availability:

    Dell EMC cohesion OE four.4 and SC sequence SCOS 7.3 can be found now as no-cost software improvements for clients with an active Dell ProSupport agreement.

    further elements:

    About Dell EMC

    Dell EMC, a part of Dell technologies, enables organizations to modernize, automate and radically change their records middle the use of business-leading converged infrastructure, servers, storage and records protection technologies.  This provides a depended on basis for groups to seriously change IT, in the course of the advent of a hybrid cloud, and transform their enterprise through the creation of cloud-native purposes and big records solutions.  Dell EMC capabilities shoppers throughout a hundred and eighty countries – including 98 percent of the Fortune 500 – with the trade's most comprehensive and imaginative portfolio from part to core to cloud.

    Copyright © 2018 Dell Inc. or its subsidiaries. All Rights Reserved. Dell, EMC and different emblems are logos of Dell Inc. or its subsidiaries. different emblems could be emblems of their respective house owners. 

    i according to Dell inside revenue information may 2016-April 2018

    ii in response to internal tests carried out in February, 2018 evaluating SC9000 running 7.3 vs. 7.2 firmware on one hundred% sequential reads with 4K sector transfer measurement. precise performance will fluctuate in keeping with configuration, usage and manufacturing variability.

    iii based on inner exams performed in February, 2018 on SC9000, SC7020, SC5020 and SCv3020 arrays operating 7.three vs. 7.2 firmware on one hundred% sequential reads with 4K sector switch dimension. actual efficiency will fluctuate in response to configuration, utilization and manufacturing variability.

    iv in accordance with interior checks carried out in February, 2018 on SC9000, SC7020, SC5020 and SCv3020 arrays evaluating 7.3 vs. 7.2 firmware operating 70% reads, 30% writes with 4K sector transfer dimension. actual efficiency will fluctuate in accordance with configuration, usage and manufacturing variability.

    v according to internal assessments carried out in February, 2018 on SC9000, SC7020 and SC5020 arrays operating 7.3 vs. seventy two firmware.

    vi according to interior exams performed by way of Dell EMC on SCv3000 array with and with out allotted sparing mode lively. exact performance will differ according to configuration, usage and manufacturing variability.

    vii in accordance with inside checks carried out in February, 2018 on SC9000, SC7020 and SC5020 arrays operating one hundred% sequential reads with 4K sector switch dimension.  precise efficiency will differ in line with configuration, utilization and manufacturing variability.

    viii in accordance with inside checks performed via Dell EMC on an SC9000 with 7.three vs. 7.2 firmware.  exact performance will vary in accordance with configuration, utilization and manufacturing variability.

    ix in line with internal assessments carried out via Dell EMC on an SC9000 with 7.three vs. 7.2 firmware. exact performance will differ based on configuration, utilization and manufacturing variability.

    x according to inner assessments performed by using Dell EMC in February 2018 operating TPC-E like workloads (ninety five% reads, 8K sector switch dimension) on an SC9000 with 7.three vs 7.2 firmware. actual performance will differ in keeping with configuration, utilization and manufacturing variability.

    Cision View usual content material with multimedia:https://www.prnewswire.com/information-releases/dell-emc-continues-relentless-innovation-in-dell-emc-cohesion-and-sc-sequence-midrange-storage-arrays-300685510.html

    source Dell EMC


    Dell EMC committed to networking, shares product and partnership plans | killexams.com Real Questions and Pass4sure dumps

    Dell EMC has one of the crucial broadest networking portfolios within the trade. What’s interesting about Dell EMC’s method is that it's a mixture of its personal expertise, in addition to network partners. additionally, it presents usual hardware items and application-best items and supports white-field implementation. As an industry watcher, I’ve all the time been confused through the approach of Dell EMC Networking. i know I’m not on my own in this, as other community authorities I’ve talked to have echoed this sentiment.

    recently, I had a chance to talk with Tom Burns, senior vp and widespread supervisor of Dell EMC Networking solutions, concerning the enterprise's networking portfolio and asked if he might make clear what's included in it.

    -------------------------------

    the majority of Dell EMC's profits come from compute infrastructures comparable to servers and storage. can you inform me if Dell is dedicated to networking? if so, why is it crucial to Dell?

    Burns: A core a part of the Dell EMC strategy is to aid our valued clientele handle the digital transformation it is taking place (the explosion and demand for records), and we do that with several strategic pillars, certainly one of which is the IT transformation.

    we are helping our valued clientele modernize, automate, and seriously change their IT infrastructure to provide agility and suppleness to their ambiance, and obviously networking plays a important role during this transformation. We agree with the area is relocating to software-described every little thing, and networking performs a crucial half. Dell applied sciences' mixed assets round Open Networking, NSX, and SD-WAN supply powerful differentiation to our purchasers and partners globally, and as a result, networking is strategically crucial to Dell.

    How do you need americans to believe of Dell Networking? Innovator? speedy follower? expense efficiency-chief? Any proof features to guide your place?

    Burns: With our method round open, disaggregated switching, which we led 5 years ago available in the market, I consider we are an innovator and disrupter. agencies and service suppliers globally are recognizing the benefits of our strategy, and we're seeing the results in the increase of our DC business. we are concentrated at what's top-rated for our valued clientele, no longer just the newest in speeds and feeds. or not it's vital to be aware that with our leadership during this area, all the different main networking suppliers have adopted.

    tom burnsDell EMC

    Tom Burns, SVP and GM, Dell EMC Networking options

    in addition, we are concentrated on capitalizing on our strong position in compute and storage. We’ve currently announced innovation options within the MX7000 launch, providing unmatched guide for fabric connectivity; the industry’s first material automation for hyper-converged infrastructure (HCI) with our VxRail product; and embedded switching capabilities for our storage and information insurance policy portfolio. Working with our teams across Dell EMC, we are growing leading end-to-end options in CI, HCI, and traditional IT.

    can you please provide a high-stage overview of the portfolio? I comprehend it's very large, and i'm certain most network managers aren’t aware of the breadth of solutions.

    Burns: Dell has an entire portfolio of both DC and campus switches, starting from 1GB to 100GB of bandwidth. Our DC items, primarily our S and Z series fixed formed aspect switches, supply surprising products for spine-and-leaf architectures of 1, 10, 25, 50, and 100G with dissimilar alternatives around number of ports. (See illustration bellow.)

    dell emc networking porfolioDell EMC

    moreover, we recently delivered a new set of blade networking items in guide of our MX7000 next-generation modular compute platform. From a campus viewpoint, we now have our N series portfolio and OEM relationships with each Aerohive and Ruckus (now owned by using ARRIS) on instant. this is the Dell EMC set of items. within the family unit of Dell technologies, we additionally present a few items from VMware around NSX and SD-WAN (formerly VeloCloud).

    in the event you describe the portfolio, it appears to be a combined bag of Dell infrastructure and partnerships. Why has Dell taken this approach?

    Burns: We companion in exactly a couple of areas:

    within the enviornment of providing networking software beyond our own OS10, here is core to our networking method round disaggregation and providing consumers option vs. locking them into a proprietary stack. These are companions corresponding to large swap, Cumulus Networks, IP Infusion, and Pluribus Networks.

    an additional area is in instant, the place we have OEM relationships with Aerohive and Ruckus. These partnerships once more have been strategically driven vs. our personal IP to provide consumers with alternative and alternatives. Dell EMC is well positioned for subsequent-generation campus networking in the course of the exciting mixture of Dell Networking campus switching hardware and a choice of cloud-managed, controller-primarily based and controller-much less instant architectures for the contemporary enterprise.

    The ultimate area can be within the enviornment of network protection. we've strong partnerships with both Sonicwall and Palo Alto Networks.

    a number of constituents of your portfolio are utility most effective — Cumulus, BigSwitch, OpenSwitch, etc. This could indicate that hardware isn't any longer essential. Do you believe this? Disagree?

    Burns: completely disagree. while a software-defined environment enables greater flexibility to configure, monitor, and virtualize the network, lots of the intelligence and pleasant of provider is coming from the hardware. These application companies each present a different NOS (network operating system) it's relevant for certain use cases or customer ambiance that need to have the applicable guide from high-quality hardware.

    in addition, we see big increase in the merchant silicon ecosystem for networking. With unheard of levels of choice, our hardware groups are perpetually evaluating this landscape to define the most excellent roadmap for our shoppers.

    beyond merchant silicon, we see many purchasers expressing an activity in a secure give chain. even if two switches appear similar from a design perspective, they originate from distinctive supply chains. At Dell EMC, we at all times consider the give chain behind a bit of hardware as essential as the hardware itself.

    Why was OS10 such a crucial release for Dell?

    Burns: OS10 is our next-generation NOS that is offering our valued clientele a full stack between hardware and software. it's made out of two essential add-ons: the OS10 Base, which is what we've contributed to the open-supply group by the use of OPX within the Linux groundwork, and OS10 business edition, which enhances the base with the full stack of typical protocols and lines.

    OS10 is a totally disaggregated community working gadget that offers our consumers a call of networking stacks. it's in keeping with open-sourced Linux and network protocol stacks developed over switch Abstraction Interface (SAI) that enable equipment improvements and DevOps-ready solutions through utterly programmatic and open interfaces.

    Dell positions itself as an open networking vendor. basically each dealer claims this, although. what is Dell's place on being open?

    Burns: Open ability offering choice and adaptability. Open means making true contributions to open supply and endorsing the strategy to our partners and purchasers. name an additional vendor that helps not only its personal NOS, but those of three or more different partners. This supportability is important and differentiated — nobody does this apart from Dell EMC. name others which have made colossal open supply contributions to the Linux foundation and to the OCP (Open Compute project). while all have followed with assisting disaggregated hardware and application, few have changed their DC method to lead with open networking.

    When network managers are looking for an open answer, what may still they look for? What key questions may still they ask the vendor?

    Burns: The questions customers should ask themselves:

    How they can i make my networking function greater like my compute or further and further my storage atmosphere. How do I take out the complexity through the use of normal equipment for configuration, monitoring and administration? Is the seller attempting to aid me make issues extra simple, or proceed to drive proprietary architectures into my infrastructure?

    Then they could ask the dealer:

  • can you support hardware and a 3rd-birthday party utility on a global groundwork?
  • Can your hardware support diverse overlays?
  • Is your answer developing extra flexibility and assisting power working can charge out vs. conserving things “status quo” when it comes to our networking?
  • anything else entertaining on the roadmap that you could share?

    Burns: There are a lot of unique things that we already developed and commenced supplying to our clients this 12 months. during the last few quarters, we rolled out several new products and options both in new platforms and new utility capabilities and help:

  • We lately introduced Dell EMC Networking SmartFabric services for VxRail deployments, automating up to ninety eight percent of the community configuration steps for VxRail hyper-converged environments.
  • We additionally announced our latest 25GbE-enabled S5200-ON correct-of-rack switches to assist shoppers modernize and meet the becoming community demands of virtualization, cloud computing, massive information and IoT.
  • last quarter we introduced our new Z9264F-ON 100GbE platform, delivering open networking in a high-efficiency, high-density swap.
  • We also brought a new line of products this year – the digital area Platform (VEP). We see big boom out there for SD-WAN and different virtualized network capabilities to run on uCPE (conventional CPE) structures. Our VEP portfolio was designed to participate explicitly in this market.
  • however as we look ahead to subsequent yr and past, there are a couple of things that we’re doing to permit stronger enterprise results for shoppers through our open, requisites-primarily based strategy to community disaggregation throughout a wide selection of environments and use cases. You’ll see us develop our support of open-supply applied sciences, together with Linux groundwork OPX and Microsoft SONiC. You’ll see our collaboration with VMware continue to evolve as part of a Dell applied sciences-large strategy to enabling digital an IT transformation. and you’ll see us working closely throughout Dell EMC to convey the fabric that ties our complete options portfolio collectively.

    -------------------------------

    ultimate note: I went into the meeting with Tom Burns with the intention of recommending that Dell EMC agree with selling the networking business, as the strategy appeared a little ad hoc. The interview with Mr. Burns introduced some clarity to it, and that i believe the approach is each clear and differentiated. besides the fact that children, I suppose the range of its portfolio can additionally cling customers again from deploying since it may additionally no longer be evident to many network engineers when a pure application product is more suitable than an built-in one or what Aerohive’s strengths are over Ruckus or vice versa.

    Dell EMC has a good possibility to establish itself as a major network power, nevertheless it should invest in both advertising and marketing and features to support clients take advantage of the large portfolio.

    be a part of the community World communities on fb and LinkedIn to touch upon themes which are accurate of intellect.

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    Sohaib Alabdi, Head of information network and Infrastructure area at institution of Bahrain, stated: "Innovation, digitization and entrepreneurial spirit is essential in shaping a nation's economy. To this goal, we at university of Bahrain believe that institutional success means riding innovation at every stage, embracing advanced expertise and making certain our students are future-ready. therefore, we have been looking for a relied on marketing consultant and have partnered with Dell EMC. via this partnership, we aim to show UOB right into a future-proof and world-class hub for transformation, business and innovation and chart our course to understand one of the vital basic pursuits of the Bahrain's economic imaginative and prescient 2030 - the creation of a sustainable and advantage-primarily based financial system and society."  

    Wael Attiya, Director of assistance technology core, at tuition of Bahrain brought: "Digital transformation is ushering in an period of extraordinary changes within the company landscape. On this note, it is clear that Digital Transformation isn't well-nigh know-how. or not it's about driving human progress by means of empowering gaining knowledge of in techniques under no circumstances imagined before. In light of this, we desired to put money into constructing a powerful technology-pushed studying ambiance to make sure personnel readiness, which is vital to growing a data and innovation-backed economic system.

    "via this partnership we goal to aid UOB create a wise campus with americans that are smartly outfitted for the digital age. moreover, it'll support UOB to obtain its latest transformation plan desires that are aligned with the Bahrain's financial imaginative and prescient 2030. And, we are satisfied to have partnered with Dell EMC on our innovation experience."

    Samer Diya, nation manager, Oman & Bahrain at Dell EMC, commented: "school of Bahrain become searching for a solution that helps the establishment enhance its tempo of innovation and offers its college students and school the most useful levels of service. via our industry-main VDI and HCI options, the institution has been able to leverage an integrated infrastructure to create a virtual computing atmosphere it really is easily flexible and scalable to meet the demands of day after today. we're joyful to be a part of their transformative adventure, as they circulation a step closer in realizing their digital future, producing the subsequent era of professional professionals in Bahrain and furthering human growth."


    E20-350 Network Storage - SAN Implementation

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    E20-350 exam Dumps Source : Network Storage - SAN Implementation

    Test Code : E20-350
    Test Name : Network Storage - SAN Implementation
    Vendor Name : EMC
    Q&A : 110 Real Questions

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    Network Storage - SAN Implementation

    Pass 4 sure E20-350 dumps | Killexams.com E20-350 real questions | [HOSTED-SITE]

    The Basics of SAN Implementation, Part II Page 2 | killexams.com real questions and Pass4sure dumps

    Download the authoritative guide: Enterprise Data Storage 2018: Optimizing Your Storage Infrastructure

    Most of the attention on SANs has focused on the performance benefits of a dedicated gigabit network that relieves conventional LANs of data movement loads. But, from a more holistic perspective, SANs will provide other significant advantages such as improved storage implementation, manageability, more reliable and flexible backup operations, and shared storage resources among multiple servers.

    For peak demand periods, SAN-based implementations offer the ability to allocate additional resources to priority applications and servers. While server re-allocation is possible without SANs, such an approach is far less useful as storage resources cannot be shared. A powerful combination is dynamic server allocation with the ability to add or change storage resources without pre-determination.

    One of the most attractive features of SAN implementation technology is its impact on standard network operations. The heavy overhead that conventional storage architectures place on LANs and network file servers is eliminated by relocating storage resources to an independent network.

    With the preceding in mind, this article continues the SAN implementation theme presented in Part I, by briefly discussing other SAN implementation topics with regards to backups, clusters, appliances and database applications. Let's look at backups first.

    http://o1.qnsr.com/log/p.gif?;n=203;c=204655439;s=10655;x=7936;f=201806121855330;u=j;z=TIMESTAMP;a=20400368;e=i

    SAN Backup Implementation

    Backup operations, typically CPU intensive processes, will be completely removed from the servers. Faster, more reliable backup operations are a key component of SAN implementation. Indeed, the first generation of significant SAN-based applications will be built around a new generation of backup technologies such as:

  • LAN-Free Backup.
  • Server-Free Backup.
  • Zero Backup Window.
  • Multiple Small/Medium Libraries Versus One Large Library.
  • We'll look at each of these separately.

    LAN-Free Backup

    Enterprise storage resources reside on an independent gigabit-speed network in a SAN implementation. All data movement occurs over this high-speed dedicated network and not a standard Ethernet LAN. The effect of SAN-based, LAN-free backup is an immediate improvement in LAN performance.

    LAN-free backup technology gives multiple servers access to a single tape library connected to the SAN. Rather than the conventional Ethernet LAN, all backup operations are now routed through the gigabit-speed Fibre Channel SAN.

    A new generation of SAN-aware backup software supports this architecture. In order to share tape libraries and eliminate data movement over the LAN, the backup software, being SAN-aware, coordinates between servers to allocate tape library resources. The first widely deployed storage management application to emerge on Storage Area Networks is likely to be LAN-free backup.

    Server-free Backup

    Server-free backup takes the LAN-free backup concept a step further. Not only are all backup operations relocated from the LAN to the SAN, but by enabling direct data movement between SAN devices, SAN bandwidth is maximized. In the case of backup, this means that the data moves directly from Redundant Array of Independent Disks (RAID) disk storage to the tape library; and, thus removes the server bottleneck.

    Server-free backup leverages two key technical developments: the small computer system interface-3 (SCSI-3) block copy command (also known as third-party copy) and the Network Data Management Protocol (NDMP)-compliant software to manage communications between the server and the tape library. Also, for this application, the term "server-free" backup is actually somewhat of a misnomer. By using the NDMP to manage communications between the SAN storage devices, the server still plays a role in the backup operation and ensures that the backups are completed successfully. However, as in traditional backup operations, server intervention is minimized and all data is sent directly over the SAN and not via the server. This significantly increases performance, while improving the reliability of automated backup processes. As data moves from a server-attached RAID device to a local or network-attached tape library, conventional LAN backup operations consume a vast amount of resources, including server CPU cycles, I/O busses and LAN bandwidth. All aspects of server and network operations are impacted, thus imposing a significant performance hit.

    As data is transferred over the high-speed Fibre Channel SAN directly between the source and target storage devices, server-free backup architectures remove virtually all of this processing overhead, thus eliminating traditional backup overhead. Server-free backup solves the backup dilemma by:

  • Leveraging Fibre Channel bandwidth to dramatically increase the rate at which data can be moved.
  • Eliminating repeated data movement by enabling direct transfers between SAN storage devices.
  • Reducing the server resources required to move the data.
  • Delivering this functionality on live production systems.
  • Zero Backup Window

    The combination of NDMP-compliant backup applications and SCSI copy technology has the potential to enable another powerful SAN-based application: zero backup window. A "snapshot" of the backup data is created--in effect a point-in-time virtual mirror that requires only a small fraction of the disk space needed to create an actual mirror of the data. Instead of remaining unavailable for the duration of the backup operation, this allows the applications to be returned to production status almost immediately. The snapshot directs the backup software to the disk location of the original data for backup. If a write command is issued to update the backup data set, it is intercepted and the update is written to a new section on the disk, thus maintaining the integrity of the original data. When the backup is completed, the snapshot is deleted freeing up that disk space.

    One Large Library versus Multiple Small/Medium Libraries

    While the traditional architecture has been to choose one larger library, a SAN also enables universal access to multiple libraries. The advantage of multiple smaller libraries is redundancy (therefore uptime) and cost savings. Large silos often cost hundreds of thousands of dollars, take up significant floor space and are costly to maintain. And if they fail, you cannot continue to perform a backup. You can actually save space, cost, and never be down by having multiple smaller libraries. Having multiple small/medium libraries also allows for cost-effective redeployment of a number of units outside of the SAN.

    Implementing Integrated SANs

    Until now, customers preparing SAN implementations have been faced with two broad choices: a standards-based multi-vendor solution that forces the customer to select each piece and then attempt to integrate a total solution, or an integrated proprietary SAN solution from a single vendor. A third option is rapidly evolving: an integrated open standards SAN.

    The open integrated SAN has the potential to provide the needed interoperability with the advantages of the multi-vendor market competition, even though implementing a SAN is clearly not a plug-and-play solution. This allows customers to pick and choose the individual SAN components that best meet their unique needs. Thus, the open standards concept based on inter-vendor product testing and certification is critical to the growth of SANs.

    Depending on the size of the installation, the SAN hardware opportunity is not limited to Fibre Channel switches, routers and the Fibre cabling. These components will complement Fibre-ready disk array and tape libraries. On the software side, traditional backup applications will be used in first-generation SAN applications, but will be SAN aware to take advantage of the LAN-free and server-free backup applications.

    Now, let's look at how to implement SANs for clusters in a variety of configurations. This would include consolidations and those with SAN appliances.

    Implementing SANs for Clusters

    Dual fabrics are separate storage networks between the servers and the storage enclosures. The use of two separate fabrics ensures that no component within the storage subsystem (Host Bus Adapter (HBA), cable, or RAID controller) is a single point of failure for the cluster. Dual fabrics effectively double throughput from the server to the storage, while also protecting the system against component failures. Implementing a switched SAN adds a significant number of capabilities to the cluster:

  • Backup over SAN: Servers share tape backup devices and perform backup operations over the SAN rather than over the network.
  • Many-to-one cluster configurations: Cluster consolidation with up to 10 clusters sharing a single storage system and optional tape backup device(s).
  • Mixed storage and cluster consolidation configurations: Multiple clusters and stand-alone servers with heterogeneous supported operating systems sharing the same storage system and optional tape backup device(s).
  • Multipathing: Redundant, active HBA-to-controller connections.
  • One-to-many cluster configurations: One cluster with multiple storage systems.
  • Several different storage technologies, including logical unit number (LUN) masking and Fibre Channel switch zoning, enable these configurations for clusters. Because various operating systems claim all accessible disks, zoning and LUN masking techniques ensure that each server or cluster attached to the SAN does not see or have access to disks belonging to other servers or clusters.

    Storage and Cluster Consolidation

    In the storage environment, consolidation relates to multiple servers using resources within a single enclosure. Consolidation examples include:

  • Cluster consolidation: Shared storage for multiple clusters coexists within the same Fibre Channel enclosure attached to a SAN.
  • SAN-consolidated backup: Tape backup changers and autoloaders accessed by multiple servers over a storage area network.
  • Storage consolidation: Two or more servers each have dedicated RAID volumes inside a single storage enclosure.

    With clusters, all of these configurations should be tested, documented, and supported simultaneously on the same SANs. Each storage enclosure should support stand-alone nodes and cluster pairs. The cluster pairs should be running the same operating system on both nodes, but clusters can coexist in the same SAN, and even share the same storage enclosure.

    Integrating the SAN Appliance Implementation

    A SAN appliance implementation should enhance the availability and capabilities of the SAN. The SAN appliance is a central point of intelligence for the SAN that enables storage replication, snapshots, and virtualization in an integrated appliance rather than distributing the implementation of these features across a variety of different hardware components and software tools. Furthermore, by off-loading the processing required to execute these solutions from the servers and storage devices, the SAN appliance is appropriate for high-performance configurations and mission-critical data connected to stand-alone servers and clusters.

    A SAN appliance usually sits logically "between" the host servers and the storage, but adds only minimal latency to the overall storage system. The SAN appliance should be able to assign "virtual" storage units to each host server. The host server is unaware of the specific physical disk, array, or enclosure that it is actually using since the SAN appliance should be able to "map" the storage to any available target ID and LUN.

    Each redundant pair of SAN appliances should be able to virtualize up to four storage systems. As with the SAN-attached configurations, each redundant pair of SAN appliances should be able to support up to 10 cluster pairs or a combination of up to 20 clustered and nonclustered hosts.

    Partitioning can be useful for separating logical data units or for enforcing quotas. When configuring an active/active cluster in which separate disk resources must be available for both servers, the creation of multiple RAID volumes is a requirement.

    A SAN appliance can be configured to provide data replication either locally (over a Fibre Channel network), remotely (over an IP network), or both. This process is transparent to the cluster nodes and the applications.

    For combined local and remote mirroring, also referred to as three-way mirroring, the source RAID volume is replicated to two different targets: one locally using Fibre Channel (packetized SCSI over Fibre Channel) and one remotely using an IP network. The availability of a local copy of the storage protects the cluster from a complete failure of the primary storage system. The SAN appliance can detect the failover of the primary storage system and make the failover to the local replica instantly, without interfering with the cluster's operations. If both copies of the local storage fail, all I/Os are routed to the remote storage.

  • Local mirroring via Fibre Channel Protocol (FCP) is always synchronous and supported for distances up to 500 meters over multimode fiber, or one or more storage systems may be located up to 10 kilometers from the SAN appliance if Fibre Channel switches with long-wave gigabit interface converters (GBICs) and single-mode fiber are used. Remote mirroring over an IP network supports either synchronous or asynchronous mirroring and can support distances greater than 10 kilometers.

    Finally, let's look at why applications that depend on an ever-increasing amount of data are now seen as a strategic resource and, in some cases, a key source of revenue for organizations. In the past 11 years or so, there has been a virtual renaissance in the information and computing field--particularly around storage.

    Implementing SANs for Database Applications

    Gone are the days when only the most essential information was kept on computer storage or disk drives (DASD for those who have been around for awhile). This was due, in large part, to the high cost of storage and associated interfaces. Also gone, are the days of double digit dollar per megabyte costs, proprietary and expensive interfaces and costs associated with managing storage (well, almost).

    Open systems and open interfaces including parallel SCSI and non-proprietary storage devices including parallel SCSI RAID, have helped drive storage prices down to the current range of well under a dollar per megabyte. Today, new requirements including disaster tolerance, extended distances, world-wide applications, along with content-based web applications and databases, have placed an emphasis on storage being scalable, modular, highly available, fast, open, and cost effective. While existing parallel SCSI storage and, in particular, RAID arrays, have gone a long way towards addressing these requirements. The storage industry is still limited to evolving towards the "virtual data center" vision or concept by storage interfaces and proprietary solutions.

    New Storage Interfaces

    The storage interface or "plumbing" that sits between the host computer systems and storage devices (like parallel SCSI) is now nearing or, in some cases, has become itself a hindrance to growth. That is not to say that open interfaces like parallel SCSI are dead or dying — far from that. Rather, a new storage interface is needed for new growth-oriented applications for high bandwidth distributed applications, and for applications that need large amounts of data moved to various systems. In fact, parallel SCSI will continue to co-exist in many environments and is part of an overall storage area network (SAN) storage implementation strategy.

    You should keep in mind that the key to configuring storage for performance and database applications is to avoid contention or choke points. So, you should avoid the mistake of trying to use a single, fast, Fibre Channel interface or loop to support all the storage when implementing a SAN for database environments. Instead, to spread I/O devices such as RAID arrays on different interfaces to avoid contention, you should use multiple Fibre Channel host bus adapters along with existing parallel SCSI adapters.

    For example, a "SAN Box" is the simplest and easiest way to implement a SAN and gain experience that can be used for implementing a full-blown SAN. A "SAN Box" is simply a small SAN made up of a host system with a Fibre Channel adapter, a storage device, and either copper or fiber optic cabling. The hardware components for a SAN include Fibre Channel host bus adapters, cabling (copper or optical), hubs or switches, and storage devices like RAID arrays. Device drivers for the host bus adapters, management software, and optional, special function host software, are software components you may need to include. Special function software includes host mirroring software for remote or disaster tolerant mirroring of storage, backup software to access SAN devices, data sharing or file replication software, clustering software, or distributed locking for messaging and database applications.

    You might want to implement some small production SANs based upon hubs or switches that enable groups of systems to share storage and resources as a next step. A subsequent step would be to interconnect various sub-SANs and implement zoning or volume mapping to isolate storage to specific host systems for data integrity. Volume mapping enables a shared storage device, such as a LUN on a RAID array, to be mapped to a specific host system. In a shared storage environment, volume mapping ensures that only the authorized or mapped host can access the LUN.

    Furthermore, for a different application or for performance reasons, you should consider implementing a second SAN that is isolated from the first SAN. Up to now, cost and availability has been the main advantage of using hubs for simple or small SANs. During 2003, you should expect to see a shift in the industry where more switches will be deployed to connect multiple sub-SANs together. Reduced cost per port of switches, increased functionality, management tools, and interoperability, is what will drive this shift towards an increase in switch use.

    You may need more bandwidth than provided by a single loop or hub. Of course, this depends on the needs of your SAN. For increasing bandwidth in a SAN for host-to-SAN, within a SAN, and storage device-to-SAN connections, there exists a couple of methods. For example, additional host bus adapters may be added and attached to separate hubs, loops, or switch ports, to increase the bandwidth between a host and a SAN. Since there is still a single shared loop, by simply inter-connecting two or more hubs together without a switch, will not increase bandwidth. However, by interconnecting two hubs with a switch that will provide 100MB/second on each of the two hub loops (as well as, for each of the switch ports), performance can be increased. By using a switch to increase bandwidth between various points in the SAN, Inter-SAN performance can also be increased.

    Finally, hubs will continue to be a popular and easy method for implementing SANs, for small or simple SANs. In SAN and LAN environments, comparisons can be drawn between use of hubs and switches. In order for a concentrator and a device to simplify cabling, hubs can provide similar functions for both SANs and LANs. The same would apply in a SAN--where a switch would be deployed in a LAN to interconnect various sub-LANs or segments. The choice between switch and hub should not have to be binary. Rather, hubs and switches compliment each other and are both key components in a SAN. In fact, to enable more devices to attach to a given number of ports, to help offset the cost of switch port costs, hubs can also be used to front-end switches.

    Summary And Conclusions

    Storage Area Networks are the next great leap forward in storage. The ability to locate storage resources on a dedicated gigabit-speed network with shared access and centralized management functions holds the potential to revolutionize enterprise storage. SANs promise higher performance, improved storage reliability and availability, as well as lower total cost of ownership.

    Faster, scalable and highly available storage interfaces are needed to meet growing application and enterprise needs, in order to support the ever-increasing amounts of data storage and information retrieval. Fibre Channel is a key enabling technology or the "plumbing" for implementing Storage Area Networks (SANs) that will support tomorrows needs. In order to enhance storage connectivity by overcoming distance, performance, scalability, and availability issues, Fibre Channel and SANs are being used today. SANs will evolve over the next few years from being a storage interface to a robust storage network with enhanced capabilities including LAN-free backup; server-less backup; data and storage sharing; shared file systems; remote data copy and mirroring; and data distribution. Up to now, Fibre Channel has been deployed as loops using hubs. However, to create fabrics over the next year or two, these loops will be interconnected or networked using Fibre Channel switches. Therefore, without the headaches and issues associated with loops, switches will enable many of the promised features of Fibre Channel.

    Over the next few years, Fibre Channel can be expected to undergo improvements and enhancements, including faster performance. Today, not all host or system vendors have Fibre Channel products. And, interoperability issues are still being addressed. Some older host systems may not support the industry-standard fibre channel-arbitrated loop (FC-AL) protocol. It is important to verify which Fibre Channel protocol a vendor is talking about. Storage networks consisting of hubs and switches will be needed to ensure adequate performance and redundancy, for all but the smallest systems.

    Given the vast numbers of installed parallel SCSI peripherals, it will be a couple of years before Fibre Channel overtakes parallel SCSI as a dominant storage interface. It is safe to say that parallel SCSI will be around for some time to come. However, as a new storage interface, Fibre Channel is here and is gaining momentum. Now is the time to start planning and making decisions regarding storage interfaces.

    There are steps that can be taken to prepare for a SAN, whether you are implementing a SAN today, or investigating the technology for a future implementation. First of all, Fibre Channel and SANs should be seen as an enhanced storage interface to replace or supplement existing parallel SCSI interfaces. Although faster than parallel SCSI, Fibre Channel should be treated as an I/O interface and thus it should not be overloaded. For example, like a parallel SCSI interface, it is not a good idea to place too many devices on a single Fibre Channel interface. Instead, spread the I/O over multiple interfaces.

    Second, SANs can be implemented in phases and may include some of your existing storage devices. Cost for SAN components are dropping while feature and functions are increasing. This allows you to implement Fibre Channel JBOD today and tomorrow migrate it to Fibre Channel to Fibre Channel RAID controllers.

    Third, you can configure your SAN with multiple sub-SANs or switched segments, where certain systems and storage can be isolated and mapped to specific hosts. This is similar to your network environment, which may include sub-nets or switched segments.

    Fourth, over the next couple of years, SAN technology developments will include enhancements to performance from 100MB/second to 400MB/second. Interoperability will continue to improve and SAN hardware components will continue to evolve. Also continuing to evolve, will be SAN software for data sharing, file replication, mirroring, SAN backup and other applications.

    Finally, the storage industry has the challenge to deliver open interoperable SANs to meet the huge demand for this innovative storage architecture. Overland is convinced that the best way to deliver these new capabilities is with a partnership approach. Open standards are always the preferred option, but the market won't wait for bureaucratic organizations to issue their proclamations. The combination of vendor certification and an adoption of de-facto market standards will speed the development of SANs with a ready supply of hardware and software products and the channel partners to deliver them.

    About the Author: John Vacca is an information technology consultant and author. Since 1982, John has authored 36 technical books including The Essential Guide To Storage Area Networks, published by Prentice Hall. John was the computer security official for NASA's space station program (Freedom) and the International Space Station Program, from 1988 until his early retirement from NASA in 1995. John can be reached at jvacca@hti.net.

    » See All Articles by Columnist John Vacca


    Storage area network basics you need to know before you buy a SAN | killexams.com real questions and Pass4sure dumps

    What you will learn in this tip: If your IT environment is growing at a steady pace, and you never seem to have...

    enough storage, it may be time to buy a storage area network (SAN). But before you buy a SAN, review these storage area network basics.

    There are many reasons why you may want to buy a SAN. Some benefits of a SAN include the following:

  • A SAN allows you to pool disk storage resources and allocate to systems only as needed instead of allocating entire disks to systems.
  • With a SAN, storage is shared at the block level instead of at the file or directory level. This means that individual systems can format the disk space as needed or use raw volumes.
  • Some applications such as Exchange 2010 are only supported on block-level storage.
  • Companies may want to use diskless systems (such as blades) to boot from the SAN. 
  • Storage area network basics: What is a SAN?

    The first storage area network basic concept you need to know is the general definition of a SAN. A SAN is shared block-level storage made available through a dedicated network. This is in contrast with network-attached storage (NAS), which is file-level storage accessed via a regular IP network. It is often confusing because both are accessed via a network -- the important difference is that a SAN is exclusive to block-level storage. This means that disk storage is seen by a server as if it were local and not on a network. Also worth remembering is that a storage array by itself is not a SAN; a SAN is the combination of the shared storage array, the network and other devices as a whole connecting it to the servers or hosts.

    Fibre Channel vs. iSCSI SANs

    There are two main types of SANs available: Fibre Channel (FC) and iSCSI, which are essentially protocols used to access block-level storage. Early SAN offerings focused on FC. When FC SANs were introduced, they mostly appealed to enterprise-class IT organization because of its higher cost -- an FC network requires special adapters called host bus adapters (HBAs), FC cables and FC switches. iSCSI came after Fibre Channel and offers a much more affordable alternative to FC because it can leverage a regular IP network to connect the servers to the storage array. 

    iSCSI SANs still require special adapters, or initiators, to convert SCSI protocol to IP but do not require special network components or cabling. In fact, it’s possible to use a regular network card (NIC) in conjunction with an iSCSI software initiator to implement an iSCSI SAN without special equipment. The only thing you would need to do this is a shared storage array that has iSCSI ports.

    What works for SMBs?

    Generally speaking, iSCSI SANs are more accessible to small- to medium-sized businesses (SMBs) than Fibre Channel SAN solutions. The main reason is the cost of equipment. There is also the question of acquiring new skills to manage the Fibre Channel network when a FC switch is used. Because of the difficulties FC SANs can present to small businesses, iSCSI SANs are more appealing to SMBs. Besides the requirement of a storage array and special adapters or initiator software, you can deploy an iSCSI SAN using a conventional high bandwidth IP network while leveraging existing IP network skills.

    Buying your first SAN: A checklist

    Follow this high-level list of components your SMB would need to deploy an iSCSI SAN:

  • A shared storage array with iSCSI ports.
  • Storage management software. This will help you to create and assign storage shares. Keep in mind that storage management software may or may not come with the storage array.
  • High-bandwidth dedicated IP network segment. While iSCSI can run on a shared network with other IP traffic, a dedicated network segment is recommended to avoid performance degradation.
  • iSCSI hardware and software initiators (host adapters) for the servers that will share storage on the SAN.
  • Other SAN implementation considerations

    When considering the implementation of a SAN, there are a few other storage area network basics that must be considered to ensure the solution will meet the objectives and requirements. Some of these elements include:

  • Number of hosts supported. The storage array must be able to support the number of servers that will share storage. This is dictated by the number of LUNs that can be created. For example, an entry-level device that only supports 14 LUNs will limit the number of servers that can share storage to 14.
  • Redundancy. Moving your data to centralized shared storage also means the risk of losing access to all data in the event of a storage array failure. Selection criteria must therefore include internal components redundancy and the ability to replace them without taking an outage (hot swappable).
  • Data protection. Very much aligned with the previous bullet, data backup and data protection services must also be considered. While the solutions mentioned earlier also come with data protection features such as snapshot or point-in-time copy capabilities, a proper offsite data protection scheme is still required. These arrays support local or remote replication, but from an SMB perspective, the cost of a second storage array can be prohibitive and hard to justify. In such case, a traditional data backup (i.e., tape backup) might still be required for offsite data protection.
  • As with any other IT solution, developing an understanding of storage area network basics should come first, followed by research on products and features.

    About this author: Pierre Dorion is the data center practice director and a senior consultant with Long View Systems Inc. in Phoenix, Ariz., specializing in the areas of business continuity and DR planning services and corporate data protection.


    Applications for storage area networks | killexams.com real questions and Pass4sure dumps

    An excerpt from Designing Storage Area Networks examines some of the applications that can benefit most from SANs.

    BY TOM CLARK

    Although storage area networks (SANs) share common components in the form of servers, storage, and interconnect devices, the configuration of a storage network is determined by the application problems it resolves. The requirements for a full-motion video application differ from those for high-availability online transaction processing (OLTP).

    LAN-free tape-backup applications may use unique hardware and software products that would not appear in a SAN designed around server-clustering requirements. Because SANs offer the flexibility of networking, however, it is possible to satisfy the needs of multiple applications within a single networked configuration, just as a LAN backbone may service disparate applications for an enterprise.

    Figure 1: A peer video-editing SAN via a switched fabric

    Click here to enlarge image

    The following application studies examine SAN installations that were designed to meet specific requirements. In some instances, the deployment of a new networked infrastructure has provided additional opportunities for resolving unrelated issues. A SAN designed for a high-bandwidth application, for example, also facilitates a more efficient tape-backup solution. Although SANs are not a panacea for every storage application need, the building blocks that SANs provide can be used to construct a wide range of viable solutions unattainable by other means.

    Full-motion video

    Using one of the first applications of Fibre Channel technology, full-motion video editing and broadcast companies have leveraged the bandwidth, distance, and shared resources that SANs enable. Digitized video has several unique requirements, including the sustained transmission of multiple 30MBps streams and intolerance for disruption or delays, which exceed the capabilities of legacy data transports. Most SAN-based video applications use the SCSI-3 protocol to move data from disk to workstations, although custom configurations have been engineered using Internet Protocol (IP) for multicast and broadcast distribution.

    Figure 2: Video SAN for sports training

    Click here to enlarge image

    Some of the first video SANs used arbitrated loop for the underlying topology. An efficiently designed loop will support three video streams but is susceptible to the potential disruption of loop initialization primitives (LIPs) or loss of all streams if a node on the shared transport misbehaves. The dedicated bandwidth that a fabric provides is more suitable for video applications but requires fabric services that were not originally available for host bus adapters (HBAs) and disks. A number of installations in use today are therefore based on private loop switching. Loop switching accommodates the various levels of private loop HBAs in workstations (e.g., NT, Mac, and SGI) while offering the connectivity and per-port throughput of a fabric switch. As HBA and disk vendors have developed fabric service support on their products, fabrics have gradually displaced loop switching for these operations.

    Video applications have common transport requirements but vary considerably in content. A video-editing application may center on a workgroup configuration, as shown in Figure 1, allowing peer workstations to access and modify video streams from one or more disk arrays. In addition to the physical SAN topology, any application that allows data sharing must have software support for file access and locking by multiple users. A video broadcast application that serves up content from a central data source to multiple feeds must have the means to support IP multicast across the Fibre Channel network. Video used for training applications may support both editing workstations and user stations, with random access to shared video clips or instructional modules digitized on disk.

    Figure 3: Prepress SAN with switched and loop segments

    Click here to enlarge image

    Video over Fibre Channel has appeared in some surprising locations, such as on the desktops of football coaches for major university and professional teams. Although it has been common practice to use video tapes of major games to analyze player performance and the strategy of the opposing teams, the mechanical limitations of video tape make it difficult to access individual plays quickly for analysis. Access to archived games is also difficult, since tapes must be cataloged, stored, and manually mounted for playback. These limitations are overcome by digitizing video to disk via editing workstations and then marking the play sequences with software pointers. A coach can then pull up any desired portion of a game for playback, using recorder-type controls for slow motion, rewind, and stop motion. The storage requirements for such an application are quite high-potentially terabytes of data-as is the bandwidth required to drive multiple coach workstations and training rooms for players. Distance is also a factor, since workstations may be spread across an entire floor or multiple floors of a facility.

    Figure 2 depicts a small SAN configuration for shared access to digitized video stored on disk. Since the retrieved plays are relatively short and are called up at random, the duration of video streaming to multiple coach stations is sporadic, bursty traffic. This prevents the 100MBps cascade link between the storage/editing switch and the coach/training switch from becoming a bottleneck, as it might if the streams were persistent. The video-editing workstations are used to load the digitized video to disk and to place software markers for plays and so are best positioned on the same fabric as the disk arrays. This simple configuration is expanded to support additional coach stations by cascading more fabric switches from the root, storage/editing switch. Some installations of this type may have 20 or more coach stations interconnected by the SAN.

    Figure 4: Tape backup across a departmental network

    Click here to enlarge image

    Although the Fibre Channel fabric switches, HBAs, and disk arrays enable this application to be implemented, the SAN-specific components are the least expensive items in the configuration. The software required to convert and catalog the digitized data and to create a user interface that facilitates play analysis represents the major portion of the investment. According to the coaches who use these systems, the return on investment is amply demonstrated by the games they have won.

    Prepress operations

    "Prepress" refers to the creation and modification of graphical images for advertisements, catalogs, and posters. Graphics can be as simple as low-resolution black-and-white newspaper ads or as sophisticated as large, four-color, high-resolution images applied to billboards or city buses.

    Unlike full-motion video applications, computerized prepress data traffic is always bursty in nature. A single graphics image is read from disk, rendered for several hours by a graphics artist at a workstation and written back to disk. The file may pass through multiple revisions, and therefore multiple workstations, as other detail, titles, and legends are added. When graphical editing is complete, the file is then read by a preprint processor for conversion from digital format to hardcopy or print negative.

    Since a graphical image must go through a series of editing steps-each by a different artist-as it passes through the production process, file ownership is critical for maintaining data integrity. If the same image is inadvertently opened and modified at the same time, hours of work can be lost. Software companies that specialize in prepress operations resolve this potential problem by providing file-sharing middleware. This software resides on each workstation and, by intercepting calls from the operating system to the file system, allows file ownership to be transferred serially from one user to another as the file is read from and written back to disk.

    In addition to file ownership, the amount of time it takes to read a large graphics image from disk for editing and write back the modified version is an important issue for prepress. Read/write time is, for the user, downtime, and the accumulated downtime between edits can impact the entire production process. For larger prepress operations in particular, the bandwidth supplied by a LAN is insufficient for concurrent file transfers of image files that are often in the hundreds of megabytes.

    Like video applications, prepress has a voracious appetite for storage. A catalog production, for example, may require hundreds of gigabytes of storage for high- resolution photographic images and formatting information. A major brands consumer catalog may have three or more editions per year, with revisions of some product images and introduction of new ones. All of this data must be maintained and accessible for updates. File compression helps reduce the overall storage requirement but is less effective for high-resolution images.

    Figure 5: Transitional LAN-free backup implementation

    Click here to enlarge image

    SANs were introduced into prepress operations primarily by vendors of file-access software. As a total solution, the combination of file-access middleware, higher bandwidth and shared storage via Fibre Channel, and increased storage capacity provided by Fibre Channel disk arrays addresses most of the data infrastructure issues prepress operators face.

    In Figure 3, graphics artists are segmented into smaller, shared 100MBps loops, whereas RAID disk enclosures reside on dedicated 100MBps links via a fabric switch. The distribution of users is scalable, since additional users may be accommodated with other loop segments and the population of each loop adjusted according to workload and bandwidth requirements. Shared storage in this configuration is also scalable, both by the addition of drives into the RAID enclosures and by attachment of new arrays over time. Specialized preprint processors are brought into the SAN via Fibre Channel-to-SCSI bridges. And finally, file-access software on each graphics workstation ensures a file can be modified by only one user at a time and that the identity of the current owner is known. This SAN solution also provides greater efficiency by transporting graphics files with SCSI protocol, as opposed to IP or IPX overhead required by a LAN transport.

    Tape backup

    For IT operations, tape backup poses a number of problems, none of which are easily addressed by traditional parallel SCSI or LAN-based methods. As long as disk arrays are bound to individual servers, tape-backup options are limited to server-attached tape subsystems or transport of backup data across the messaging network. Provisioning each server with its own tape-backup system is an expensive solution and requires additional overhead for administration of scheduling and tape rotation on multiple tape units. Performing backups across the production LAN allows for the centralization of administration to one or more large tape subsystems but burdens the messaging network with much higher traffic volumes during backup operations. In addition, scheduling backups for multiple servers to a central tape resource creates an inherent contradiction between the time required to back up all servers and the time available for nondisruptive access to the network. Scheduling backups during nonpeak hours-8:00 pm to 6:00 am-may not provide sufficient time to back up all data and is not an option for enterprises that operate across multiple or international time zones.

    Figure 6: LAN-free and server-free tape-backup installation

    Click here to enlarge image

    In Figure 4, four departmental servers share a common tape-backup resource across the production LAN. Even with switched 100Mbps Ethernet and no competing user traffic, the maximum sustained throughput from server to tape is approximately 25GB per hour. If each server supports a very moderate 100GB of data, a full backup of the department's data would require 16 hours. Backups, how ever, are normally scheduled for incremental backup of changed files on a daily basis, with full disk backups occurring only once a month or quarter. To accommodate both full and incremental backups, the full-backup routines would have to be rotated among different servers on different days and then only during periods when full LAN bandwidth was available.

    As the volume of data exceeds the allowable backup window and stresses the bandwidth capacity of the messaging network, either the bandwidth of the messaging network must be increased or the backup data must be removed from the messaging network altogether. Installing a high-speed LAN transport such as switched Gigabit Ethernet can alleviate the burden on the production network but leaves the server/storage relationship unchanged. Just as the user saturation of 10Mbps Ethernet engendered 100Mbps Ethernet and the saturation of 100Mbps Ethernet begot Gigabit Ethernet, opening larger pipes on the LAN may not provide a long-term solution. If you build bandwidth, user data will come. Resolving the potential conflict between user traffic and storage-backup requirements is accomplished, therefore, only by isolating each onto separate networks. A storage network removes backup data from the production network, provides an equivalent high-speed transport to Gigabit Ethernet, and, by separating servers from storage, allows other backup and storage technologies to emerge.

    Figure 7: A fully redundant server cluster using arbitrated loop for shared access

    Click here to enlarge image

    As a transitional configuration, the SAN in Figure 5 is installed solely to offload the production network. Existing parallel SCSI-attached drives are left intact, and the new components include only Fibre Channel HBAs, a loop hub or fabric switch, and a Fibre Channel-to-SCSI bridge. Since the tape subsystem appears to each server as another SCSI device on a separate SCSI bus, it is accessible to the tape-backup client residing on each server. The backup scheduler instructs each server when and what kind of backup to perform on a sequential basis. Since the backup data path is now across a dedicated SAN, the constraints of the messaging network are removed from the backup process, and the burden of backup traffic is removed from the LAN.

    The 100MBps bandwidth provided by Fibre Channel and the flexibility of moving backup data on its own transport, however, do not resolve every issue associated with this backup implementation. Although the SAN transport may allow backup data to move at high speed, other limiting factors include server performance, data rate of the parallel SCSI drives, the type of data being backed up, performance of the FC-SCSI bridge, and the throughput of the tape subsystem itself. The slowest component in a backup configuration is usually determined by the tape drive's sustained streaming rate. A tape unit may be able to stream only 10MBps to 15MBps and so cannot fully use the bandwidth Fibre Channel makes available. The overall time required for full backups is thus improved only moderately by Fibre Channel, although the scheduling itself is no longer dependent on or interferes with LAN traffic patterns.

    Since each of the four servers is now provisioned with a Fibre Channel HBA, other options are available for reducing backup times. Some Fibre Channel-to-SCSI bridges offer two Fibre Channel interfaces. If the SAN interconnect is a fabric switch, two servers can perform concurrent backups to two bridge-attached tape subsystems, thus cutting the overall backup time in half.

    Figure 8: A small ISP implementation using NAS

    Click here to enlarge image

    Optimizing the backup routine further requires several additional SAN components. Moving disk storage from parallel SCSI to Fibre Channel-attached arrays offers, among other things, the ability to remove the server from the backup data path. This is the most significant improvement from the standpoint of performance and nondisruptive backup operations. If server resources are freed from backup tasks, the servers are always available for user access. And if the backup process itself does not interfere with user access to data, the backup window is no longer defined by users or the relatively slow performance of the tape subsystem.

    Backups may be performed at any time, provided that the backup software handles file permissions and updates and that a Fibre Channel-attached backup agent exists to buffer data from disk to tape. The backup agent may exist as a Network Data Management Protocol (NDMP) or as a Third Party Copy protocol utility resident on the interconnect, a dedicated Fibre Channel-attached backup server, or in a Fibre Channel-to-SCSI bridge or native Fibre Channel tape subsystem.

    Figure 6 demonstrates an extension of the departmental tape-backup solution that incorporates Fibre Channel-attached disk arrays and a Third Party Copy or NDMP utility resident on a Fibre Channel-to-SCSI bridge. In this configuration, backup data is read directly from disk by the copy agent and written to tape, bypassing the server. Whereas the SAN provides the vehicle to move the backup data, the backup software must control when and where to move it. Concurrent backup and user access to the same data are possible if the backup protocol maintains metadata-file information about the actual data-to track changes that users may make to data, such as records, as it is being written to tape. As higher- performance native Fibre Channel tape subsystems become available, the ability to back up and restore over the SAN will better accommodate the growing volume of data that enterprises generate.

    Server clustering

    As enterprise applications have shifted from mainframe and midrange systems to application and file servers, the reliable access to data that the legacy systems provided-and that required decades of engineering to accomplish-has been compromised. To make their products acceptable for enterprise use, server manufacturers have responded with more-sophisticated designs that offer dual power supplies, dual LAN interfaces, multiple processors, and other features to enhance performance and availability. The potential failure of an individual component within a server is thus accommodated with redundancy, which typically implies hardware features but may also include redundant software components, including applications. Extending this strategy, redundancy may also be provided simply by duplicating the servers, with multiple servers running identical applications. The failure of a hardware or software module within a server is accommodated by shifting users from the failed server to one or more servers in a cluster.

    Figure 9: ISP configuration using storage networking

    Click here to enlarge image

    The software required to reassign users from one server to another with minimal disruption to applications is very complex. Clustering software written for high-availability implementations may trigger on the failure of a component of the hardware, protocol, or application. The recovery process must preserve user network addressing, login information, current status, open applications, open files, and so on. This is no small task, which may in part account for the delays in embedding clustering into the operating system. Clustering software may also include the ability to load-balance between active servers, so that in addition to fail-over support, the servers in a cluster can be maximized for increasing overall performance.

    Small clusters can be deployed with traditional parallel SCSI cabling for shared data but are generally limited to two servers. Fibre Channel allows server clusters to scale to very large shared data configurations, with more than a hundred servers in a single cluster. Whether this is implemented with arbitrated loop or a combination of fabrics and loop depends on the traffic volumes required by user applications.

    Since the focus of clustering is to facilitate availability, deploying a server cluster on a SAN typically includes redundant paths from multiple servers to data. Software on each server must monitor the health of hardware components and applications and be able to inform other servers in the cluster if a failure or loss of service occurs. This heartbeat status is normally propagated over a dedicated, and sometimes redundant, LAN interface. If redundant paths to data are provided, each server must also monitor the status of each SAN connection and redirect storage traffic if a loop or switch segment fails. In addition, the data itself may be secured via local or remote RAID mirroring, which provides a duplicate copy if a primary storage unit fails. This tiered strategy helps ensure the availability of servers, access to data, and the data itself.

    Figure 10: Campus storage network

    Click here to enlarge image

    In the site represented in Figure 7, a cluster of 10 servers is supported by arbitrated loop in a redundant, shared data scheme. Two 12-port loop hubs are configured as primary and backup paths between the clustered servers and RAID disk arrays. For this installation, the status heartbeat is also configured with redundant Ethernet links between each server, so that the failure of an Ethernet link will not falsely trigger a condition in which each server would attempt to assume services for others. Since the clustering software determines what components or applications on each server should be covered by a failure, subsets of recovery policies can be defined within the 10-server cluster. In this configuration, all servers share a common database application, whereas subsets of three servers are configured for fail-over for specific user applications. The example configuration can also be scaled to accommodate additional servers or storage by either cascading additional hubs on each loop or, depending on bandwidth requirements, subdividing primary and backup loops into smaller segments, using switching hubs or fabrics.

    Internet service providers

    Internet service providers, or ISPs, that provide Web-hosting services have traditionally implemented servers with internal or SCSI-attached storage. For smaller ISPs, internal or direct-attached disks are sufficient as long as storage requirements do not exceed the capacity of those devices. For larger ISPs hosting multiple sites, storage requirements may exceed SCSI-attached capacity of individual servers. Implementation of network-attached storage (NAS) or SANs are both viable options for supplying additional data storage for these configurations.

    In addition to storage needs, maintaining availability of Web services is critical for ISP operations. Because access to a Website-URL, or uniform resource locator-is based on Domain Name System (DNS) rather than physical addressing, it is possible to deploy redundant Web servers as a fail-over strategy. If a primary server fails, another server can assume access responsibility via a round-robin DNS address resolution. For sites that rely on internal or SCSI-attached storage, this implies that each server and its attached storage must maintain a duplicate copy of data. This is a workable solution as long as the data itself is not dynamic, that is, consists primarily of read-only information. It is a less attractive option, however, for e-commerce applications, which must continually update user data, online orders, and inventory tracking information. The shift from read-mostly to more dynamic read/write requirements encourages the separation of storage from individual servers. With NAS or SAN-attached disk arrays, data is more easily mirrored for redundancy and is made available to multiple servers for fail-over operation. As Figure 8 illustrates, NAS provides common data access over shared or switched Ethernet, allowing multiple Web servers to exist in a fail-over configuration.

    Figure 11: Fibre Channel-based disaster-recovery implementation

    Click here to enlarge image

    SAN architecture brings additional benefits to ISP configurations by freeing up bandwidth on the provider's LAN segments, providing high-speed data access between servers and storage, and facilitating tape-backup operations. As shown in Figure 9, storage traffic is isolated from the LAN data path, which helps ensure data integrity even if problems occur on the LAN transport. At the same time, read/write operations to disk do not burden the LAN with additional traffic, which allows the LAN to be designed around external access requirements alone. LAN or server-free backup is enabled by SAN-attached tape subsystem and NDMP or Third Party Copy software utilities, which further frees LAN bandwidth for users. Expansion of storage and growth of Web servers are accommodated by extending the SAN with additional fabric switches or loop hubs. This small configuration can scale to hundreds of servers and terabytes of data, with no degradation of service.

    Campus storage networks

    Server-based applications and storage present several contradictions for IT management of extended networks. Decentralized servers and storage provide the convenience and higher speed of local user access but require higher administrative overhead for maintaining and backing up multiple sites. Centralizing servers and storage to a data center reduces administrative requirements and allows consolidation of server resources but restricts remote users to the bandwidth available via the WAN. Traditionally, centralizing resources has meant provisioning multiple high-speed WAN links to each site just to achieve 1MBps to 5MBps bandwidth, which is often insufficient to supply the response time users demand. Even with high- performance routers and data-compression techniques, the WAN may become a bottleneck for both peer traffic and file retrieval between remote sites and a data center.

    Fibre Channel's support of 10km links facilitates the search for a compromise between distributed and centralized data access. Using longwave lasers and multimode cabling, multiple sites in a campus or metropolitan area network can be brought together in an extended SAN. As shown in Figure 10, each building has a local SAN, which, depending on traffic requirements, is based on arbitrated loop or a departmental fabric switch. The local SAN provides high-speed access and storage sharing for the users at each site. By linking remote sites to a central data center via singlemode fiber, servers at each remote location also have access to centralized storage. This configuration also allows each remote site to be backed up to large tape subsystems maintained by the data center. In the example shown, the development building is provisioned with two fiber-optic links. This is to accommodate retrieval of engineering drawing files archived on data center RAIDs. By load-balancing across multiple switch links, an effective throughput of up to 200MBps can be achieved.

    This extended SAN helps resolve data-security issues via backup and sharing of centralized storage by multiple remote locations but still requires software to control volume assignment and file locking if data is to be shared among remote servers. Particularly in NT environments, it is essential to administer which storage devices an NT server can access. Common access to a shared tape subsystem likewise requires scheduling software and the ability to alter ownership of the tape resource dynamically such as via zoning on a fabric switch.

    Disaster recovery

    Similar to campus SANs, disaster-recovery implementations are leveraging Fibre Channel's support for 10km 100MBps links to provide remote disk mirroring and tape-backup requirements. Using Fibre Channel extenders, it is possible to achieve distances of more than 60km if the disaster-recovery site is more than 10km away. Enterprise networks that invest in disaster recovery will normally deploy additional safeguards, including high-availability server clustering, RAID, and redundant data paths via dual loops or fabric switches.

    Figure 11 illustrates a disaster-recovery solution that uses long-wave, singlemode fiber cabling between the production and disaster-recovery sites, with fully redundant data paths for each location. To avoid propagation delays for every transaction, each site is configured with fabric switches instead of arbitrated loop hubs. This provides higher-speed access at the production site, with only disaster recovery-specific traffic traversing the long haul. In the example shown, the primary application at the production site is a relational database. To keep the disaster-recovery site current, only updated records are required, which further reduces the burden on the 6-mile link. Periodic tape backup can be performed against the disaster-recovery disks, which achieves the goal of data security without incurring additional overhead on the production servers. Redundant data paths at each location prevent the failure of a link or a switch from disrupting either production or data-copying applications, whereas dual Fibre Channel connections to the Fibre Channel-to-SCSI bridge ensure a path is always available for the tape subsystem. This configuration could be further optimized, at some expense, by deploying two fibers for each 6-mile link, thus increasing the capacity to 200MBps, if desired.

    Tom Clark is director of technical marketing at Nishan Systems. He is also a board member of the Storage Networking Industry Association (SNIA), co-chair of the SNIA Interoperability Committee, and the author of (Addison Wesley Longman).

    This article is excerpted with permission from Designing Storage Area Networks, A Practical Reference for Implementing Fibre Channel SANs, by Tom Clark (Addison-Wesley, 0-201-61584-3, copyright 1999, Addison Wesley Longman).

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